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Reading of patch test reactions according to International Contact Dermatitis Research Group guidelines |
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| Score |
Patch test reaction |
Criteria |
|
|
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| - |
Negative |
No reaction |
| +? |
Doubtful |
Faint erythema only |
| + |
Weak |
Erythema, infiltration, possibly papules |
| ++ |
Strong positive |
Erythema, infiltration, papules, vesicles |
| +++ |
Extreme positive |
Intense erythema and infiltration and coalescing vesicles |
Jensen and Andersen Environmental Health: A Global Access Science Source 2003 2:3 doi:10.1186/1476-069X-2-3 |
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